Tandem Diabetes officer plans sale of 360 shares

Tandem Diabetes Care, Inc. (TNDM) is the issuer for a notice under Rule 144 filed for the account of officer Mark Novara covering a proposed sale of up to 360 shares of common stock.

Rhea-AI Filing Summary

Tandem Diabetes Care, Inc. (TNDM) is the issuer for a notice under Rule 144 filed for the account of officer Mark Novara covering a proposed sale of up to 360 shares of common stock. The shares relate to restricted stock units with a listed date of September 15, 2026 and are to be sold through Morgan Stanley Smith Barney LLC on Nasdaq, with an estimated aggregate value of $6,310.80 as shown in the filing.

The notice also reports that, during the prior three months, 10b5-1 sales for Mark Novara included a sale of 131 shares of Tandem Diabetes Care common stock on August 18, 2026 for an aggregate amount of $2,906.89.

Key Figures

Proposed shares to be sold: 360 shares Estimated aggregate value of proposed sale: $6,310.80 Shares sold in past 3 months: 131 shares +2 more

5 metrics

Proposed shares to be sold 360 shares Common stock covered by the Rule 144 notice for officer Mark Novara

Estimated aggregate value of proposed sale $6,310.80 Value associated with 360 shares of Tandem Diabetes Care common stock

Shares sold in past 3 months 131 shares 10b5-1 sale on August 18, 2026 for Mark Novara

Aggregate amount for past 3‑month sale $2,906.89 Value of 131 shares sold on August 18, 2026

RSU reference date September 15, 2026 Date tied to restricted stock units underlying the 360 shares

Key Terms

Rule 144, Restricted Stock Units, 10b5-1, Common, +1 more

5 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Restricted Stock Units financial

"Common | 09/15/2026 | Restricted Stock Units | Issuer"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

10b5-1 regulatory

"10b5-1 Sales for MARK NOVARA"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

Common financial

"Common | Morgan Stanley Smith Barney LLC Executive Financial Services"

NASDAQ market

"69578707 | 09/17/2026 | NASDAQ"

The Nasdaq is a stock exchange where many companies' shares are bought and sold, functioning much like a marketplace for investments. It matters to investors because it provides a platform to buy and sell ownership stakes in companies, helping them track the value of those companies and make informed decisions. As one of the largest and most technology-focused markets, it also reflects trends and developments in the business world.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Form 144 filing for TNDM by Mark Novara disclose?

It discloses a proposed sale of up to 360 shares of Tandem Diabetes Care, Inc. common stock for the account of officer Mark Novara under Rule 144, with the shares linked to restricted stock units dated September 15, 2026 and to be sold through Morgan Stanley Smith Barney LLC.

How many TNDM shares are proposed to be sold under this Rule 144 notice?

The notice covers up to 360 shares of Tandem Diabetes Care common stock. The filing lists these shares in connection with restricted stock units dated September 15, 2026 and indicates an estimated aggregate value of $6,310.80 for the proposed sale.

What prior TNDM share sales by Mark Novara are reported in the last three months?

The filing reports that, in the past three months, 10b5-1 sales for Mark Novara included the sale of 131 shares of Tandem Diabetes Care common stock on August 18, 2026 for an aggregate amount of $2,906.89.

Which broker is listed for the proposed TNDM stock sale in the Form 144?

The proposed sale of Tandem Diabetes Care common stock is listed through Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, 8th Floor, New York, NY 10004, with trading indicated on the Nasdaq market.

On what dates are the key events in this TNDM Form 144 filing?

The restricted stock units referenced are dated September 15, 2026, the broker-related section lists a date of September 17, 2026, and reported 10b5-1 sales during the past three months include a trade on August 18, 2026.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/17/2026 - 04:33 PM Accepted by SEC EDGAR 09/17/2026 - 04:32 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0002000342
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Tandem Diabetes Care, Inc.
SEC File Number	001-36189
Address of Issuer	12400 High Bluff Drive San Diego CALIFORNIA 92130
Phone	8583666900
Name of Person for Whose Account the Securities are To Be Sold	MARK NOVARA
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	360	6310.80	69578707	09/17/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	09/15/2026	Restricted Stock Units	Issuer			360	09/15/2026	N/A

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales for MARK NOVARA 12400 High Bluff Drive San Diego CA 92130	Common	08/18/2026	131	2906.89

144: Remarks and Signature

Remarks
Date of Notice	09/17/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	12/04/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Mark Novara
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)